Manufacture of tubing.



P. PATTERSON. MANUFACTURE OF TUBING. APPLIOATION FILED SEPT. 15, 1911.

Patented 001211912.

3 SHEETS-SHEET 1.

INVENTOR.

WITNESSES. i, W. fie/M- P. PATTERSON.

MANUFAUTURE OP TUBING.

APPLIOATION FILED SEPT. 15,1911. I

Patented Oct. 29, 1912.

3 SHEETSSHEET 2.

wrrNEssEs XV? ff lll lllli P. PATTERSON. MANUFACTURE or TUBING.APPLICATION FILED SEPT. 15, 1911. I Patented 0011.29, 1912.

3 BHEETS-8HBET 3.

. H w Q J WITNESSES side; heating the plates in UNITED STATES PATENTOFFICE.

PETER PATTERSON, OF PITTSBURGH, PENNSYLVANIA.

MANUFACTURE OF TUBING.

To all whom it may concern:

Be it known that I, PETER PATTERSON, a citizen of the United States, andresident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in theMannfacture of Tubing; and I do hereby declare the following to be afull, clear, and exact description thereof.

My invention relates to the manufacture of tubing, its general objectsbeing to 1ncrease the output and the quality of the pipe and to producea larger proportion of pipe; and its special objects being to rovide forthe more uniform working of blanks for the manufacture of lap weldtubing by mes in true cylindrical form and so do away with the necessityof the rounding of he pipe ends for threading, and yet care for all thepipe Welded so that large outputs can be obtained; and by the removal ofthe scale from the pipe during the cooling thereof to polish th themanufacture of much more perfect pipe, doing away with the necessity ofreheating and rerolling, increasing the production and forming the Wholebody of the pipe of true cylindrical form much more perfect and rustresisting surface.

To these ends my invention comprises the following steps; alternatelycharging lates into two ben ing furnaces located side by one furnacewhen kept closed while drawing the plates from the other furnace andbending them into skelp; charging the heated bent skelp from bothbending furnaces into the one welding furnace and raisingthe sametherein to ding heat and welding them into tubing: sub ecting the weldedtubing to a prolonged cross roll finishing at aslow forward feed, thesame time. removing the scale rom the surfaces thereof in the crossrolling, is continued until the tubing is brought below a scaling heat,thereby holding the tubing in true cylindrical form until it is set,providing a smooth surface and forming a permanent protective oxid onsuch surface.

It also comprises certain steps in this gen- Specification of LettersPatent. Application filed September 15, 1911.

Patented Got. 29, 1912. Serial N 0. 649,465.

eral manufacture as bending furnace; Fig. larged top or rolls; and Fig.6 same.

That my improved manufacture of tub-in may be more easily understood Iwill first describe an approved plant for practising the same.

Referring to Fig. 1, 1 and 2 are the bending furnaces set side by sidein which the skelp plates are heated, the drawing showing four plates oneach hearth. 3 is the plate charging machine adapted to travel laterallyacross the front of the furnaces, 1 and 2, and 4 is the scarfing machinealso the rear of the furnding machine which can be of any desired form.The bending machine 5 delivers the skelp onto the rack 6 from which theyare charged by'the pusher is illustrated as traveling latthe weldingfurnace pushed into the rolls which are moved into lding machine has therolls 10 and the receiving trough 11 rolls 13 at the welding machine areformed of two concave rolls power driven and have t 'e cross rollfinishing machines.

p 0y two sets of finishing rolls 16, 17

e feeding t em and th 22 leading to the cooling table I prefer toprovide the cross roll finishing machines 'with rolls of travel of thepipe through the mployed is ab f the rolls, that f the produc ascommonly e revolution to take care 0 per necessary of the welding set offinishing rolls is ishing rolls as pref practice of my invent dinal feedof the three inches per revel bein accomplished by t of the rolls an orset given thereto.

'view Fig. 5, and t the finishing rolls,

rolls 24 set diagonally and between so located th rolls it contacts wi2o port for the purpose In the pr above apparatus, t the two bendingfurnaces a plates upon the in the regular example, four 25 furnace, and

soon as one furnace is so 26, 2? of that furna plates therein are suheat and all cooling of the entrance of air th until the plates aretemperature at wh ered from the furnace. be made narrower furnace nowemploye made wide enough to and in this way l a the number of platesheat into slrelp by, say one-th' d 40 ployment of two furnaces,

scar

d more uniform he in each one because th and the furnace can be operatethe flame and heat e and to heat the check ators, overcoming the thefurnace by a s a greater heat it is reversed. ated because quired thearth,

A higher he the flame and 0 travel so great a while as the doors 0 canbe kept closed for overcoming the sucking the same, a much higher anheat is produce nace can b bending heat. charged into the of the furnacea are being withd furnace, the ch ling and bendin laterally into line wh as are pushed from the e more quic means finishing rolls 1 way. issoon as the plates have all been out 5% inches fed from that furnace,for example, from speed being the furnace 1, the charging and scarfingtion t mechanism is moved into line with the other furnace in theordinary below 1000" Fah. and the exposure of the furnace where only asingle furnace 2 and the plates fed therefrom as m employed. The finineeded, the first furnace 1 being re-eharged 1y employed in the withplates and the doors closed subjecting ion operate at a longi? theplates in this furnace to the high heat f about two or thereof withoutdisturbance by the entrance ution of the rolls, this of air while theplates from the second fur- 5 he angular position nace are being formedinto skelp. in this d by the concavity Way a full supply may be providedfor the As shown in the enlarged single welding furnace 8, beingdelivered he cross section Fig. 6 of on the rack 6 and carried down inproper poeach set is formed of two sition for feeding into the weldingfur- 5 and slightly concave, Iiace by the pusher 7 and the skelp as sothe pipe sup provided being at a higher heat than pracat as the pipe isrotated by the ticable where only a single bending for th the surface ofthe supnace is employed; and therefore less timeis hereinafterdescribed. required for bringing the same up to the the invention withth proper welding heat in the welding furnace. are charged into As theskelp are brought to the proper lternatively, for welding heat they arepushed out through hearth of each the welding rolls of the weldingmachine operation a onto the trough 11, the mandrel bar is withd thedoors drawn by the mandrel bar puller 12 and the losed so that the pipedelivered laterally over into the trough o a high steady 1i and thenpassed through the sizing mafurnace by th chine 13 into the trough 15..They are cardoors prevented ried along this trough and deliveredaltere5 brought up nearly to the nately to the troughs 18 and 19 of thefinishich they are to be deliv' ing rolls l6 and 17 each alternate pipepass- Each furnac can ing through the same set of finishing rolls thesingle bending into the receiving trough 20 or 21, and being d, wherethe hearth is then delivered into the delivery trough 22 we receive,say, six plates, and thence to the cooling table. As each set in enabledto increase of ,finishing rolls receives only each alternate ed forbending pipe, and as these rolls are operated at a By the can very slowspeed, even though the apparatus however, a higher is able to take careof all the pipe welded, be maintained the pipe are subjected toprolonged cross e hearth is narrower roll finishing at slow forwardfeed, being d to carry Cooled not only by the absorption of the ntirelyacross the hearth heat from the pipe by the finishing rolls but erworkof the regenerr by water cooling over their surfaces so that necessityof forcing in the prolonged cross roll finishing they draft, andcarrying are brought down to a low temperature and it into the furnacewhen being first brought to true cylindrical shape at is thus generandheld within said rolls until set, so that heat are not rethey are muchbelow the temperature at distance over the which they would be liable tosag and lose f the furnace shape when on the cooling table. In thislonger period, slow cross roll finishing the surfaces of the in of airthrough pipe are carried continually over the pipe d more uniformsupport of the finishing rolls and contact of d and the plates in eachfurthe pipe surface with such pipe support is, kly raised to the properpractically doubled because of the slow feed When the plates are of thepipes through the finishing rolls, thus bendin furnace the doorsscraping 0d the scale from the pipe forming d while the plates smoothsurfaces thereon free from scale and from the other bendin fact largelypolished. In this treatment urging and scarfing or the pipe are broughtdown to a temperature us being moved below the ordinary scaling heat,indeed, to lates, and they a temperature in the neighborhood of or ipipe where a larger number smooth surfaces formed on the pipe, under thewater cooling and the exposure to the atmosphere leads to the formationof a er- Inanent oxid coating on the pipe which prowill only refer to thFor example, the carriage 30 1s Illustrated as carrying both thescarfing rolls 31 and t e bending example, the rolls 33, 34, 3 operationis practicallv the same as above escribed with the addition that eachWeldpipe passes through two sets of finishing h way that when it leavesthe fimshing the proper temperature for the formation of suc permanentoxid coating which is gradually formed thereon in the further cooling onthe cooling table.

)ne pipe passing through the sizing rolls is fed into the trough 18 andpasses through the finishing rolls 16 while the next pipe is fed intothe trough 19 and passes through t e finishing rolls 17 and thus the twosets ishing rolls are acting on two different pipes at the same time, sothat I am enabled to apply this prolonged cross roll finishing at slowforward feed while taking care of as many pipe as are produced by theWelding nace in ordinary operation. The slow cross roll finishing bringsthe pipe to such low heat that they are set, and as the pipe pass they.are not liable to warp in the ad smaller sized pipe produced in thewelding rnace, prolonged cooling action being obor even a greatercooling action by such successive cross roll finishin shape.

Fig. 3 shows another Variation in the arrangement of the plant,illustrating three sets of cross roll ishing machines, as shown at 40,41 and 42. In this case the pipe first passes through the sizing rolls13 and into the trough 43 from which it passes directly through thefinishing rolls 0 w ich may be driven, at the full speed heretoforeemployed for this class of rolls. .It then passes into the trough 44 andeach alternate pipe passes to the trough 45 and cold rounding-up processis done away with. through the 1511' I am thus enabled to obtain amuch-greater next pipe passe to production because I am enabled to providethrough the finishing all the skelp that the welding furnaces can 41 and42 the pipe is subjected to the protake care of and feed the skelp tothe furonged cross roll finishing at slow forward naces at a highertemperature, and I am bove described and thus held to true enabled toroll finish the same so perfectly set, when it is delivthat practicallynone of the pipe will req bove described to the cool- 4 passage throughthe welding rolls on account of being out of round or crooked whendelivered from the cooling table, and at the same time obtain theimportant advantages above set forth. I also obtain such advantageswithout extra labor cost, as no more labor is required inthe threadingmachines before being threaded, and the production threadlng machines 1sthe trough 46 and at I claim is: 4 1. The method of forming tubing,consisting in alternately bending furnaces located side by side,heatfurnace when kept particularly adapted for the forming of largerpipe, for example, pipe lQinches in 'ameter and larger.

In Fig. 2 I have shown a plant for practising the inventionwhich is moreparticularly adapted for the making of smaller 2. The method of makingtubing, COIISlSt' are made, the ing in alternately'charglng plates lntotwo same parts illustrated in the said Fig. 2 furnaces located side byside, heataving the same reference numerals, and I lates in one rnacewhen kept lshing rolls 41, while the rolls 42. In said rolls chargingplates into two 85 from the surince anti reolucing its temperaandwelding the same into tubing.

4. ntense from the ture helow a scaling heat, tthdl ezrposingthe tube tothe atmosphere during the further cooling to term a on in surface.

7. The herein (lescribeu method of making tubin consisting in raisingthe skelp in a sing e neldling furnace to a 'wehling heat, and welclingt e same into tuhing, feeding each nlternete tube through a separate setof cross rolls operating at slou forward feed and. thereby subjecting itto prolonged cross roll finishing until set unfit subjecting every othertube to like cross roll finishing in other sets of rolls.

8. 'llhe herein clescribecl method of making tubing, consisting inraising the shelp to a Welding heat in a single weloing turnace antiweloing the same into tubing, passing each alternate weldeai tubethrough e separate cross roll finishing machine operating at slowforward feed andl then through a SBCOlMi like cross roll finishingmachine in line therewith nncl so subjecting it to prolonged cross rollfinishing at slow 'forwartl ieefl and holding it in true cylindricalshepe until set, an subjecting every other tube to like cross rollfinishing in other sets of cross rolls.

in testimony "whereof, l the saitl Pn'rnn Pnrrnnson hove hereunto set myhand.

PATTER$N closed while thawing the plates other furnace and locndlingthem into shelp, char ing the heetecl'bent skelp from both bendingfurnaces into one welding furnace, raising the skelp therein to aWelding heat 3. The herein described method of making tubing, consistingin raising the skelp to a Welding heat and welding the same into tubing,and subjecting the welded tubing to prolon ed cross-roll finishing atslow ton Kurd eetl untii brought below a scaling eat.

4. The herein described methou of making tubing, oonsistin in raisingthe skelp to a welding heat, on welding the same into tubing, sizinthejt bing ancl subjecting the welded and sized tubing to prolongedcrossroll finishing at slow forward feed until brought below a scalingheat.

5. The herein described method of making tubing, consisting in raisingthe skelp to a welding heat and Welding the same into tubing, sizing thetubing and subjecting the welded and sizetl tubing to rolongeo crossroll finishing and so holding it in true cylindrieal shape untilset.

6. The methocl herein described, otmahing tubing, consistng in raisingthe skelp in the weluing furnace to a welriing heat anti welding thesame into. tubin sub ecting the welclecl tubing to 'prolonge cross rollfinishing at slow torwarcl feedl in content with a tube support, therebyremoving the scale Witnesses:

gunner C. To'mnn, Jenn Whit.

permanent oxid conting

